Use dex2oatd when available on debug builds

Enable use of dex2oatd for background dexopt service for eng and
userdebug builds.  This allows us to have more extensive checking
on dogfood devices.

(cherry picked from commit 2118ec4d)

Bug: 68025088
Test: runtest -x services/tests/servicetests/src/com/android/server/pm/dex/DexoptOptionsTests.java
Merged-In: I292ac7f355350edc8cf06f417740226ee6bac65d
Change-Id: I292ac7f355350edc8cf06f417740226ee6bac65d